Formative 2

Block 'a' represents :

• Filter circuit

• Timing circuit

• Amplifier circuit

• Feedback circuit

The frequency of oscillations depends upon the value of inductance, XL and capacitance, Xc.

• True

• False

In order for oscillation to occur :

i) Phase shift around feedback loop must be 180 degree

ii) The voltage gain around the loop must be unity

• TRUE

• FALSE

LC feedback oscillator are as listed below. EXCEPT

• Colpitts

• Hartley

• Phase Shift

• Crystal

A Collpits oscillator is having :

C1=24nF, C2=270nF and L=5mH.

Determine the frequency of oscillation

• 4.15kHz

• 15.16kHz

• 4.15MHz

• 15.16MHz

Circuit in figure is know as:

• Colpitts oscillator

• Hartley oscillator

• Armstrong oscillator

• Crystal oscillator

Circuit in figure is known as:

• Colpitts oscillator

• Harley oscillator

• Armstong oscillator

• Phase Shift